ESB-2018.0137.2 - UPDATE [Ubuntu] intel-microcode: Access privileged data - Existing account 2018-01-23

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             AUSCERT External Security Bulletin Redistribution

                              ESB-2018.0137.2
                          Intel Microcode update
                              23 January 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           intel-microcode
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-5715  

Reference:         ASB-2018.0009
                   ASB-2018.0002.4
                   ESB-2018.0133
                   ESB-2018.0118
                   ESB-2018.0047
                   ESB-2018.0046
                   ESB-2018.0044
                   ESB-2018.0042

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3531-1

Revision History:  January 23 2018: provided the microcode updates required 
                                    for the corresponding Linux kernel updates
                   January 12 2018: Initial Release

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Ubuntu Security Notice USN-3531-2
January 22, 2018

intel-microcode regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- - Ubuntu 17.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

USN-3531-1 introduced regressions in intel-microcode.

Software Description:
- - intel-microcode: Processor microcode for Intel CPUs

Details:

USN-3531-1 updated Intel microcode to the 20180108 release. Regressions
were discovered in the microcode updates which could cause system
instability on certain hardware platforms. At the request of Intel, we have
reverted to the previous packaged microcode version, the 20170707 release.

Original advisory details:

 It was discovered that microprocessors utilizing speculative execution
 and branch prediction may allow unauthorized memory reads via sidechannel
 attacks. This flaw is known as Spectre. A local attacker could use this to
 expose sensitive information, including kernel memory. (CVE-2017-5715)
  This update provides the microcode updates required for the corresponding
 Linux kernel updates.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 17.10:
  intel-microcode                 3.20180108.0+really20170707ubuntu17.10.1

Ubuntu 16.04 LTS:
  intel-microcode                 3.20180108.0+really20170707ubuntu16.04.1

Ubuntu 14.04 LTS:
  intel-microcode                 3.20180108.0+really20170707ubuntu14.04.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://www.ubuntu.com/usn/usn-3531-2
  https://www.ubuntu.com/usn/usn-3531-1
  https://launchpad.net/bugs/1742933

Package Information:

https://launchpad.net/ubuntu/+source/intel-microcode/3.20180108.0+really20170707ubuntu17.10.1

https://launchpad.net/ubuntu/+source/intel-microcode/3.20180108.0+really20170707ubuntu16.04.1

https://launchpad.net/ubuntu/+source/intel-microcode/3.20180108.0+really20170707ubuntu14.04.1

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